For Wabco air compressors use the following procedure: Prior to installing the air compressor, identify which gasket
is going to be installed so that, if necessary, the gasket can be properly oriented.
The are two types of accessory drive cover gaskets:
ā¢ Three round oil supply passages and one elongated oil supply passage
ā¢ Four round oil supply passages
It is preferred that, when installing the air compressor, the gasket with the four round oil supply passages be used.
The gasket can be installed in any orientation. If only the gasket with the one elongated oil supply passage is
available, install the gasket so that the elongated oil supply passage is not over the oil supply port in the rear gear housing.
NOTE: Rotate the engine slightly before or after TDC, if necessary, to properly engage the compressor drive gear
with the camshaft gear.
With the engine set at TDC, install the air compressor and a new gasket onto the rear gear housing, engaging the air
compressor drive gear with the camshaft gear.
Install the air compressor mounting fasteners and tighten. Install the air compressor mounting fasteners and finger
tighten the capscrews.
Install the air compressor support bracket.
Install the air compressor support bracket to cylinder block mounting bracket mounting capscrews and finger-tighten.
Install the air compressor support bracket mounting capscrews and finger-tighten.
NOTE: For low mount designs, it is important to make sure of appropriate positioning of the air compressor relative to the engine block in order to minimize gear lash. This will help minimize noise from the gear train during normal
engine operation.
Loosen the six air compressor mounting capscrews.
Push the air compressor assembly as close to the engine block as possible and tighten the upper mounting capscrew (1).
Torque Value: 77 Nā¢m [ 57 ft-lb ]
Using the upper mounting capscrew as a pivot point, rotate the air compressor assembly in the clockwise
direction when viewed from the front of the engine.
NOTE: This action should slightly move the bottom of the air compressor assembly towards the engine block.
Tighten the lower mounting capscrew (1).
Torque Value: 77 Nā¢m [ 57 ft-lb ]
Verify the air compressor support bracket is contacting the cylinder block support bracket. Adjust the brackets as
necessary. If necessary, loosen the cylinder block support bracket to align the components.
Tighten the air compressor support bracket mounting capscrews first (1).
Tighten the compressor support bracket cylinder block support bracket mounting capscrews second (2).
If loosened, tighten the cylinder block support bracket cylinder block mounting capscrews third (3).
NOTE: Rotate the engine slightly before or after TDC, if necessary, to properly engage the compressor teeth on
the camshaft gear.
Apply clean 15W-40 engine oil or Assembly Lube, Part Number 3163087, or equivalent, to both a-ring recesses;
this will help keep the a-rings in the correct location while installing the compressor.
Install new a-rings onto the air compressor.
Locate both the large (1) and small (2) a-rings as shown in the illustration at right into the recesses; making sure they
are both located correctly.
With the engine set at TDC, install the air compressor, engaging the air compressor drive gear with the camshaft
gear.
Install the air compressor mounting fasteners and tighten.
Torque Value: 77 Nā¢m [ 57 ft-lb ]
Install the four air compressor support bracket mounting capscrews and finger-tighten.
Tighten the air compressor support bracket mounting capscrews in the sequence shown.
Torque Value: 24 Nā¢m [ 212 in-lb ]
